111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/* Copyright (C) 2003, 2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <dlfcn.h>
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#include <stdio.h>
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#include <unwind.h>
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#include <pthreadP.h>
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static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
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static _Unwind_Reason_Code (*libgcc_s_personality)
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(int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
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struct _Unwind_Context *);
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static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
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(struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
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static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
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void
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__attribute_noinline__
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pthread_cancel_init (void)
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{
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void *resume, *personality, *forcedunwind, *getcfa;
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void *handle;
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if (__builtin_expect (libgcc_s_getcfa != NULL, 1))
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{
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/* Force gcc to reload all values. */
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asm volatile ("" ::: "memory");
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return;
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}
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handle = __libc_dlopen ("libgcc_s.so.1");
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if (handle == NULL
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|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
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|| (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
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|| (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
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== NULL
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|| (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
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#ifdef ARCH_CANCEL_INIT
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|| ARCH_CANCEL_INIT (handle)
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#endif
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)
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__libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
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libgcc_s_resume = resume;
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libgcc_s_personality = personality;
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libgcc_s_forcedunwind = forcedunwind;
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/* Make sure libgcc_s_getcfa is written last. Otherwise,
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pthread_cancel_init might return early even when the pointer the
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caller is interested in is not initialized yet. */
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atomic_write_barrier ();
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libgcc_s_getcfa = getcfa;
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}
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void
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_Unwind_Resume (struct _Unwind_Exception *exc)
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{
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if (__builtin_expect (libgcc_s_resume == NULL, 0))
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pthread_cancel_init ();
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libgcc_s_resume (exc);
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}
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_Unwind_Reason_Code
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__gcc_personality_v0 (int version, _Unwind_Action actions,
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_Unwind_Exception_Class exception_class,
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struct _Unwind_Exception *ue_header,
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struct _Unwind_Context *context)
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{
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if (__builtin_expect (libgcc_s_personality == NULL, 0))
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pthread_cancel_init ();
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return libgcc_s_personality (version, actions, exception_class,
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ue_header, context);
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}
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_Unwind_Reason_Code
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_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
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void *stop_argument)
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{
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if (__builtin_expect (libgcc_s_forcedunwind == NULL, 0))
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pthread_cancel_init ();
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return libgcc_s_forcedunwind (exc, stop, stop_argument);
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}
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_Unwind_Word
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_Unwind_GetCFA (struct _Unwind_Context *context)
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{
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if (__builtin_expect (libgcc_s_getcfa == NULL, 0))
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pthread_cancel_init ();
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return libgcc_s_getcfa (context);
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}
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